Air-injector for furnaces and forges



(No Model.)

J. B. DAVIS 8'6 W. WALKER. AIR INJECTOR FOR FURNACES AND FORGES. No. 323,644. Patented Aug. 4, 1885.

WITNESSES :f-jjf- INVEN TOR 2 ATTORNEYS.

UNITED Srarns PATENT @rricn.

JOHN BENSON DAVIS AND \VILLIAM \VALKER, ()F JERMYN, PENNSYLVANIA.

AlR-INJECTOR FOR FURNACES AND FORGES.

fiPECIFICATION forming part of Letters Patent No. 323,644, dated August 1, 1885.

(No model.)

To aZZ whom it may concern:

Be it known that we, JOHN BENSON DAVIS and \VILLIAM WALKER, both of Jermyn, in the county of Lackawa-nna and State of Pennsylvania, have invented a new and Improved AinIujector for Furnaces and Forges, of which the following is a full, clear, and exact description.

Our invention relates to injectors for supplying furnaces and forges with air mingled with steam or moisture to facilitate combus' tion, protect the furnace or forge, and dcsulphurize the metal under treatment in the furnace or forge during welding or other metallu rgical operations.

The inveutiomwhich is an improvement on the injector described in United States Patent N 266,109, granted to us October 1'7, 1882, consists in novel combinations of water-chambers and a water-supply pipe with the air-pipe and the steam-jet pipe discharging therein, whereby the condensation of the steam passing toward the furnace or forge with the airis materially hastened, and the air is discharged into the furnace or forge at a proper humidity, and the consumption of water for condensing the steam is materially lessened, allas hereinafter fully described and claimed.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corrcsponding parts in both the figures.

Figure 1 is a sectional elevation of our improved injector, and Fig. 2 is a vertical sectional elevation taken on line a: 0:, Fig. 1.

The letter A indicates the furnace or forge to which air is to be supplied from the injector, the nozzle 1) of which may enter the furnace or forge at any desired point. In our former patent the air was forced or drawn in along a pipe or trunk, and carried to the furnace by the action of a jet of steam issuing into the mouth of the pipe. In the present invention the air entering the pipe or trunk B, around the nozzle 0, of the steam inlet-pipe O, is carried along pipe B by the pressure in duced by the steanrjet, and a pipe, D, connected to any available watcnsupply discharges a regulated quantity of water into the pipe 13, at or near the nozzle 0 of the steampipe C, so that the air, steam, and water fall together through pipe B into or upon a body of water, 0, contained in a chamber, E, attached at the bottom of pipe 13, and thence through an outlet, 6, into a pipe or conduit, F, which communicates with the dischargenozzle b. The aii intake B of the trunk B contracts to a throat at b, and the longer or delivery end B of the trunk gradually enlarges toward its lower end, where it is of a larger bore than at the thoat b, so that the steam issuing from the nozzle 0 past the throat will have a chance to expand in the lower end of the trunk and produce a more powerful indraft of air at the mouth of the trunk, and so that the water-jet entering the trunk just below the throat I) will have better effect in condensing the steam to the required degree on itsway to the furnace or forge fire.

At a suitable point in or along the pipe F is provided a pendent chamber or pocket, G, which has attached to it a drain-pipe or fancet, g.

The chamber E has a faucet or valved pipe, H, which opens into it at a point below the outlet 0 of the chamber, so thatthe water flowing into the chamber from pipes D and B or other source will not be allowed to flow through outlet 6, but will pass from the chamber through faucet H, which will be opened more or less as the water-supply to said chamber is increased or diminished.

At I is shown a gate-valve, which may be operated by a lever, J, to regulate the supply of air to the furnace or forge.

The operation is as follows: As the air, steam, and water descend through the pipe B together, the water almostwholly condenses the steam, and upon entering the chamber E the steam will further be condensed by contact with the body of water 0 in said chamber, and. any excess of moisture carriedfrom the chamber E by the air-current on its way to the furnace or forge will be caught by or in the chamber G, which may be drained through the pipe or faucet g. In this manner the airblast to the furnace or forge will be clicrged with sufficient moisture to aid combustion of the fuel in the furnace or forge and prevent burning out of the furnace-bars or forge-grate, and also will insure complete desulphurization of the metals in welding operations. Furthermore, we find that the steam is much more easily condensed by the use of the water-jet from pipe D, and the body of water in the chamber E than was effected by the water chamber E, as the steam will condense in the chamber by contact with the water therein,

which may be supplied from any source, butthe use of both the pipe D and chamber E, is preferred to accelerate the condensation of the steam with a minimum quantity of water.

When an injector of small size is used to supply air to a small furnace or forge, the air entering the mouth oftheinjector will be insufficient to condense the steam entering at the nozzle 0 to a required degree, hence the use of the waterjct' from pipe D is necessary with small injectors so as to lower the temperature of the steam to about 110, so as to avoid extinguishing the furnace or forge fire by an overheated moist air-blast.

There may be two or more of the chambers or pockets G fitted t0 the pipe E, if desired.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination, in an air-injector for furnaces and forges, of a trunk, B, having an intake, B, tapering to a throat, I), and a delivery end, B", gradually enlarging from the throat to the outlet, with a steam-jet pipe,

C c, and a water-inlet pipe, D, both arranged to discharge at or near the throat I), substantially as herein set forth.

2. An air-injector comprising a pipe, B,.a

steam-jet pipe, 0, a water-chamber, E, below pipe B, having water-outlet H, and a pipe, F, communicating at c with chamber E, and terminating in a discharge-nozzle, substantially as herein set forth.

3. An air-injector comprising a pipe, B, a steam-jet pipe, 0, a communicating Waterehamber, E, below pipe B, having water-outlet H, a pipe, F, provided with a chamber, G, and a nozzle, b. substantially as herein set forth.

4. An air-injector comprising a pipe, B, a steam-inlet pipe, 0, a water-inlet pipe, D, opening into pipe B, a water-chamber, E, below pipe B, and having outlet H, a pipe, F, provided with a chamber, G, and a nozzle, b substantially as herein set forth.

5. The combination, in an airinjector, of a pipe, B, asteam-jetpipe, O, a waterinlet pipe, D, opening into pipe B, a water-chamber, E, below pipe B, and having an outlet, H, a pipe,

F, communicating at 6, with chamber E, and

provided with a chamber, G, and nozzle 1), substantially as herein set forth.

JOHN BENSON DAVIS. XVILLIAM \VALKER. \Vitnesses:

ABRE. .T 1. SAHM, l. S. J OSLIN. 

